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One receiver with multiple senders

LEI JING1
Prodigy 80 points

We are using CC1110F32 for RF communication.      

Could multiple senders send the packages to the same receiver at the same time?

In case the collision happens, could the receiver still select to receive the package?

Thanks

Eric

  • 0
    TI__Guru**** 317180 points

    If you have two different RF packets on the air at the same time in the same channel you will not be able to receive any of them. The only exception is if the signal level for one of the packets is much higher than for the other packet.

    Normally LBT or similar is used to ensure that only one sender is using a given channel at a given time.

  • 0 in reply to TER
    Prodigy 80 points

    Thanks for your reply.

    For my understanding, for two electrical signals on the same cable, the receiver still can receive the overlapped signal. And the question is why it is not possible for the wireless signal. 

    Do you know any method that can pick up such packets on CC1110 or any other CPUs.

    Thanks.

    Eric 

  • 0 in reply to LEI JING1
    TI__Guru**** 317180 points

    As I pointed out according to most regulatory standards you are not allowed to start a transmission on a channel where a sender is already sending (LBT) so your setting is not realistic.

    Cable or wireless is the same. If you have more than one signal in a medium you have to be able to apply a filter to distinguish between the signals. If the two signals are operating on the same carrier frequency the two signals will be added together. 

  • 0 in reply to TER
    Prodigy 80 points

    Hi, Thanks for your kindly reply.

    We are researching on some signal demultiplexing method. We want to do the evaluation experiment in the physical environment. According to your explaination, if we do not use LBT method, we could get the overlapped signal on the receiver side for CC1110?  Obviously, this is not the regular case. And we are open mind for any suggestion. Thanks.